原子分散的Ce站点增加了PEMFC中的基于铁的氧气减少催化剂的活性和耐用性
Nan Xue1,2, Xueyan Xue1,2, Aikelaimu Aihemaiti1
1Laboratory of Environmental Sciences and Technology, Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Urumqi, 830011, China.
Small (Weinheim an der Bergstrasse, Germany)
|February 28, 2024
概括
引入Fe和Ce单原子合催化剂 (Fe/Ce-N-C) 用于质子交换膜燃料电池 (PEMFCs). 这种新的催化剂增强了氧降解反应 (ORR) 的活性和耐久性,性能优于传统的Fe-N-C材料.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 质子交换膜燃料电池 (PEMFCs) 需要高效和耐用的电催化剂来进行氧降解反应 (ORR).
- 基于的催化剂是有效的,但昂贵.
- 具有原子分散活性位点的铁和共碳 (Fe-N-C) 材料是有希望的替代品,但由于反应性氧物种的攻击,耐用性差.
研究的目的:
- 开发一种新的电催化剂,以提高ORR在PEMFC中的活性和耐久性.
- 为了研究结合Fe和Ce单个原子在添加碳支持器上的协同效应.
主要方法:
- 合成Fe和Ce单个原子的合催化剂,在ZIF-8衍生的添加碳 (Fe/Ce-N-C) 上.
- 在PEMFC中测试Fe/Ce-N-C催化剂的电化学测试.
- 在H2/空气条件下的耐用性测试.
- 密度函数理论 (DFT) 计算以阐明机制.
主要成果:
- Fe/Ce-N-C催化剂的最大功率密度为0.82 W cm-2,比Fe-N-C提高了41%.
- 催化剂表现出极好的耐用性,在3万个循环后,活性仅下降了21%.
- DFT计算显示,Fe-Ce合优化OH*中间吸附,并增强内在活性.
- 单个原子表现出令人佩的激素清除能力,有助于长期稳定.
结论:
- 铁和Ce单原子合催化剂 (Fe/Ce-N-C) 在PEMFCs的ORR电催化中提供了重大进展.
- 铁和原子之间的协同作用增强了催化活性和耐久性.
- 这项工作提出了一种新的策略,通过结合单原子共催化剂来设计强大的高性能氧降解催化剂.
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